HEAT PUMP TYPE HEAT EXCHANGER

摘要

A heat pump type air conditioner is provided to prevent overload and freezing of a compressor by increasing the temperature of refrigerant supplied from an outdoor heat exchanger to a compressor by heat of refrigerant supplied from an indoor heat exchanger by means of a multiple heat exchange part. A multiple heat exchanger part(50) induces secondary expansion of refrigerant via a cooling expansion valve for improving cooling efficiency, and includes an outer case(51), an inner case(54) and a capillary(57). The outer case has a first port(52) connected to a compressor(10) and a second port(53) connected to an outdoor heat exchanger(70). The inner case positioned in the outer case includes a third port(55) connected to an indoor heat exchanger(30) and a fourth port(56) connected to the outdoor heat exchanger, wherein lower parts of the inner and outer cases are communicated to each other for refrigerant flow. The capillary is connected between the second and third ports for guiding introduced refrigerant into branched ways, thereby improving heat exchange efficiency.